Doors · Materials

Door materials

Three materials cover almost all exterior doors: steel, fiberglass and wood. Steel is the cheapest and strongest against forced entry but dents and can rust at scratches. Fiberglass resists dents and rot and needs the least upkeep. Wood looks best and is the most expensive to buy and to maintain, because it must be refinished on a schedule.

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Exposure matters more than the brochure. A door under a deep porch overhang lives a completely different life from a west-facing door in full sun and driving rain. Wood in an unprotected opening will need refinishing far more often than the same door under cover, and that maintenance cost is the real difference between materials over twenty years.

Reported lifespans differ by material, though published figures are wide and depend heavily on exposure and maintenance. Industry sources commonly cite roughly 30–50 years for fiberglass, 30+ years for steel, and 20–40 years for wood, with well-protected doors of any material lasting longer. Take the top ends of those ranges as best-case, not expected.

A note on the price comparison: cheap steel doors and expensive fiberglass doors both exist, and the material name tells you less than the construction. Ask about the core (polyurethane foam versus polystyrene), the edge construction, and the sill and threshold material — a composite sill will not rot the way a wood one can.

Glass changes everything. Any door with a large glass area is less secure, less insulating, and more expensive than the same door solid. If the front door is the only light source in a dark entry, that trade may be worth it — just make it knowingly.

How to choose

Match the material to the exposure: Unprotected, weather-beaten opening: fiberglass or steel. Under a deep overhang, wood is far more practical.
Steel for a back or garage-side door: It is the value option for strength where appearance matters least. Accept that it dents, and touch up scratches promptly so they don't rust.
Fiberglass for lowest upkeep: Best choice if you never want to refinish anything. Modern woodgrain finishes are convincing at a normal viewing distance.
Wood only if you'll maintain it: It is genuinely a bad idea to put an unfinished or lightly finished wood door in a fully exposed opening and then not refinish it. That is how a $4,000 door fails in under a decade.
Ask about the sill, not just the door: Composite and aluminum sills resist rot better than wood. It's a small line item that determines whether the bottom of your door survives.

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All doors materials

Fiberglass Doors

Steel Doors

Wood Doors

Glass Door Inserts

Composite Doors

Impact Rated Doors

FAQ

Doors materials — common questions

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Steel or fiberglass for a front door?

Fiberglass if appearance and low maintenance matter and you can spend more; steel if budget or forced-entry resistance is the priority. Steel dents and can rust where scratched; fiberglass does neither.

How long does an entry door last?

Published estimates run roughly 30–50 years for fiberglass, 30+ for steel and 20–40 for wood, with exposure and maintenance driving the spread more than the material label.

Are wood doors a bad choice?

Not at all — in a protected opening with someone willing to refinish them, they outperform on looks and can last decades. In a fully exposed opening with no maintenance plan, they are the wrong buy.

Does more glass make a door worse?

On security and insulation, yes — glass is the weak point on both. It's a legitimate trade for daylight in a dark entry, but it should be a deliberate decision, not a default upsell.

Sources

Where these figures come from

How Long Fiberglass Exterior Doors Last vs. Steel & Wood · retrieved 2026-07-25
How Long Do Front Doors Typically Last? — Plastpro · retrieved 2026-07-25
Entry Door Replacement Cost 2026 (material tiers) · retrieved 2026-07-25